This makes me ponder, if Satan was not there, Adam & Eve wouldn't have sinned and inherited the sinful nature of Satan. I do not think they were created with sinful nature. Maybe that they inherited the sinful nature of Satan only after following his words. What do you think?
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MawiaMar 8 '13 at 9:54

4 Answers
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We don't know exactly what it will be like, but we do know, as you pointed out, that there will be no sin in heaven but that we won't be robotic beings. The difference is that we will have a different nature. Something about having fallen and then being restored to glory is going to be different than the state Adam was in having never known evil and yet excersising his free will.

Exactly what defenses will make this possible we know not, but we know that one way or another the work of Christ to sanctify his people will be brought to completion and that they will never more fall away from him.

Your speculation is based on an incorrect understanding of the nature of man and sin in the first place:

My only idea is that since the Devil will be chained for eternity, there will be nothing to tempt us [...].

Christianity's understanding of sin is not based on outside forces tempting us, but on an imperfect nature that cannot help but sin. Adam could not have helped but eventually sinning, snake or no snake. Free will is not so free as many people believe: we are bound to act according to our nature. We are not "free" to act according to a nature that we don't have. We aren't "free" to teleport just because we would will it. We are not "free" to not sin because it is part of our nature to do so.

The difference in heaven is that our natures will be regenerated into something completely different than they are now and we will be free -- but only to act according to our regenerated natures. Which won't be dragging sin into the presence of God.

Thanks for the answer. As you pointed out, our current nature is sinfull. But when I said "there will be nothing to tempt us" I was reffering to the case of our new sinless nature in Heaven, not the one we have now, being born in sin. So in the new nature, I could only imagine outside factors that would make us sin.
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FofoleMar 8 '13 at 9:40

"Adam could not have helped but eventually sinning, snake or no snake." Can you back this up a bit more? I don't think this is a very common Christian belief.
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curiousdanniiMar 16 at 0:44

I think Romans 8:29-30 gives us a bit of a hint of the mechanism of this:

Romans 8:29 For those whom he foreknew he also predestined to be conformed to
the image of his Son, in order that he might be the firstborn among
many brothers. 30 And those whom he predestined he also called, and
those whom he called he also justified, and those whom he justified he
also glorified.

There is some theological disagreement on specifics of the Ordo Solutis, but I think it is generally agreed that Christians who have been justified will be glorified as well -- and, thus fully conformed to the image of Jesus. At the end of that process, our glorified selves will then be without sin. In this sense, we will be unable to sin in the same way that Christ is unable to sin.

There's some philosophical elements that add murkiness to definitions here: there was no external constraint placed on Jesus that prevented him from sinning (so, in that sense, he was theoretically able to sin), but rather his perfect nature would not allow for it (so, in that sense, he was not functionally able to sin). Caleb's answer deals with this. An analogy might be something like a lion eating a salad: Sure he's free to do so, but his nature would never entertain such a thought, so to do so would require a drastic change of his nature or a violation of his will. With our glorified nature (conformed to that of Jesus), we will have no desire to sin, and so any sin that would be theoretically possible would be so only if our natures were changed or our wills violated. In heaven, there's no reason to believe either of these things would occur.

I think the Bible declares there will be no sin evermore but keeps the exact mechanism from our view. I wholly agree with Caleb, that the cause is not prevention of temptation but our new nature will be immune to temptation while still having free will.

Although the scripture does not explain the answer I think it does assume that this 'immunity to sin' is due to our life being derived from Christ. The first Adam communed with God but God was not eternally united with him via the incarnation. Therefore Adam's free will included the option of breaking the communion.

The second Adam has free will but not a freedom to sin because God was 'locked' as it were into his own person via the incarnation. Therefore those reborn have their life sprung from a human source that can't break communion with God. As our life is in Christ, we can't unlock our person from communion with God. In this world we have both natures as not our while life from Adam has died and resurrected yet.

A tree can't 'will' to be a fish and someone in Christ can't will himself to be someone else. We are 'locked in' without loosing our free will. Free will is not an infinite power that can break the bonds of the incarnation, or the origin and container of our own person. It is easier for a human to 'chose' to be a turtle than for a man or woman in heaven to sin.

Spirit creatures have free will just like humans and as such can and do sin. Like Adam and Eve, spirit creatures started out perfect, without sin, so when they use thier free will and deliberately give into their wrong desires and break the laws of the one who gave them life, they sin (James 1:15), and the wages of sin is death (Romans 6:23). That is where Satan and his demons come from.

Jesus could have sinned also, that is why is is the Bible says the Devil tested him (Luke 4:13), if he couldn't have sinned would it really have been a test? Regarding humans who receive the heavenly calling, they will be granted imortality, (1 Corinthians 15:54) in this way they will never die. That is why the gift of immortality is such a vote of confidence on God's part because he is saying that he trusts these ones, including Jesus, totally, and he is absolutely sure that they will never choose a life apart from him.